[Zuben Elgenubi]

Long read but informative: LINK.

[strategofr]

"(A) Close-up photograph of the symbiotic vestimentiferan tubeworm Lamellibrachia luymesi from a 'cold seep' at 550 m depth in the Gulf of Mexico."

Why 'cold' seep. Thought the water was hot (and that's where the energy came from).

[strategofr]

Might you take a quick crack at explaining the chemical complementarity between sulfate and sulfide to someone who had 2 semesters of Inorganic and 2 semesters of Organic about 25 years ago? To others: this relates to Zuben's excellent LINK above I know what these definitions mean, but can't see how the creation of one would aid the other: sul·fate (sŭl'fāt') pronunciation n. A chemical compound containing the bivalent group SO4. sul·fide (sŭl'fīd') pronunciation n. A compound of bivalent sulfur with an electropositive element or group, especially a binary compound of sulfur with a metal.